AASTRA DT4x2 for MX-ONE User Guide EN - Manual (Page 10)

Important User Information
DT412/DT422/DT432 10
Preparing for use
Before using your phone for the first time you have to charge and
connect the battery, see section “ Installation ” on page 116.
Note: Place the phone in the charger and charge it for at
least one hour before using it the first time.
Cleaning
Clean the phone only with a soft, water dampened cloth. Using
soap or any other cleaning materials may discolor or damage the
phone. Clean the battery contacts using ethanol or isopropyl
alcohol.